An American authoress, born at Cambridgepont, Mass., a woman of speculative ability and high aims, a friend of Emerson, and much esteemed by Carlyle, though he thought her enthusiasm extravagant and beyond the range of accomplishment; she was one of the leaders of the transcendental movement in America; visited Europe, and Italy in particular; engaged there in the struggle for political independence; married the young Marquis of Ossoli; sailed for New York, and was drowned with her husband and child on the sand-bars of Long Island (1810-1850).